Brake



March 31, 1931. j SNEED 1,798,360

BRAKE 4 Filed Sept. 29, 1928 2 Sheets-Sheet l F'IE ':L

March 31, 19 31. J SNEED 1,798,360

BRAKE Filed Sept. 29, 1928 ZSheets-Sheet 2 HE E WXMWTZ damn/M Patented Mar. 31, 1931 UNITED STATES PATENT OFFICE JOHN SNEED, OF FERNDALE, KICHIGAN ASSIGNOR TO THE MIDLAND STEEL PRODUCTS COHPANY, OF CLEVELAND, OHIO, A CORPORATTON OF OHIO BRAKE Application filed September 29, 1928. Serial No. 309,219.

This invention relates to brakes and more particularly to a device for determining the idle position of a brake shoe and for preventing rattling of the shoe in such position.

It is-among the objects of my invention to arrange an adjustable stop for the brake shoe to limit its inward radial movement. A further object is to provide means for positioning the stop from the outside of the brake. A still further object is to arrange indicia on the outside of the brake to show the position of the stop. A further object is to incorporate with the stop means for resiliently urging-the idle shoe against the brake apron. Amore specific object is to provide a pin slightly carried by the stop and resilien'tly urged against the brake shoe.

Other objects will appear from the following description of a preferred form of my invention, reference being had to the accompanying drawings. The essential characteristics are summarized in the claims.

In the drawings, Fig. 1 is an elevation of the brake assembly; Fig. 2 is a section taken alongthe broken line' 22 of Fig. 1; Fig. 3 shows the stop member per se; Fig. 4 shows the positioning member; Figs. 5 and 6show the clamping bolt which engages the stop and positioning members.

Referring particularly to Fig. 1, I have illustrated a slightly modified form of a well known brake also disclosed in my copending application, Serial No. 290,955, filedJul .7th, 1928. Briefly, the brake comprises a s oe S carrying brake lining L engageable with a revolving drum D. An apron or backing plate A carries an anchor pin P against which the ends of the shoe abut. The apron also has indentures I which space the shoe from the body of the apron and against which the shoe is held in idle position. Spreading .mechanism such as a toggle T serves to force the shoe into engagement with the drum. A retractor spring 1 draws the ends of the shoe upon the anchor in idle position and a retractor spring 2 urges therigid portion of the shoe 3 both upon the anchor and into engagement with a stop member 10. In illustrating my invention, I show the shoe S comprising a rigid part 3, as mentioned above,

which may be channeled in cross-section having inwardly extending side flanges and a lining supportingpart 6. The shoe also comprises a band-like part 7 joined to the channel part as at 8.

Referring also to Figs. 2. and 3, the stop member 10 comprises a body part 11 having an arcuate flange 12 which is struck from a center C and which contacts with .the lining supporting part 6 of the shoe, as at 13. The

upper part of the stop member 14 is offset and is clamped against the apron as at 15. The upper part of the member has a square or noncircular hole 16 punched therein through which a bolt 20, see also Figs. 5 and 6, having a square shank 21 passes. The body of the stop member is turned when the bolt is turned. The shank of the bolt 21 is rounded as at 22 to fit in the circular aperture 23 of the apron so that the stop member maybe rotated about the axis of the bolt to vary the distance between the point of contact '13a'nd the axis of the bolt. Thus the idle position of the shoe is determined according to the position of the stop member.

Positioned exteriorly of theapron is a member 25, see also Fig. 4, having a square aperture closely engaging the shank of they bolt 20 and having an elongated part 26 and an out turned lip 27 by which the bolt may be rotated to swing the stop member. "Thus the position of the stop member may be rotated from without the brake and one may tell from observation the position of the stop member according to the position of the member 25. A suitable nut and lock washer secures the bolt and members in any given position.

Carried by the body of the stop member is a pin 30, the head of which engages one of theside flanges of the shoe, as at 31. The bolt 30 has an enlarged head 32 and between the head 32 and the body of the stop member is a 0011 spring 33 which tends to force the bolt toward the apron. Such means as a cotter pin 34 may be passed through the other end of the bolt to hold the parts during assembly. As the brake is applied, the shoe is forced radially outwardly into engagement with the drum and away from engagement with the stop member, and when the brake shoe and thus forces the shoe toward the apron. As mentioned above, the shoe contacts with the indentures in the apron to have point contact therewith so that in idle position the spring 30 holds the shoe againstthese indentures.- i

It will be observed that regardless of the position of the stop member .within the range of its use, that the head of'the pin 30 always contacts with the side flanges of the shoe so that a rattling is not permitted between the shoe and the apron. While I have illustrated and described a preferred form of my invention, I do not care to be limited thereto or in any manner oth r than bythe claims appended hereto.

I claim 1. In a brake, the combination of an apron, a shoe having an inwardly extending part,

a member secured to the apgon and 'lyingbeside and spaced from the inwardly extend ing part of the shoe, and a pin s'lidably carried by the member and contacting with the' inwardly extending part of the shoe and being resiliently urged against the shoe.

2. lin a brake, the combination of an apron, a shoe having an inwardly extending part, a member secured to the apron and having an axially otiset part lying beside and spaced more remote from the apron than the inwardly extending part ofthe shoe, and an axially disposed pin'slidably carried by the member and contacting with the inwardly extending part of the shoe and being resiliently urged against the shoe.

3. In a brake, the combination of an apron, a shoe having an inwardly extending radial flange and an arcuate lining supporting part, and an adjustable retraction stop member engageable with the lining supporting part and carrying a pin resiliently urged against the radial flange part of the shoe.

4. In a brake, the combination of an apron, a channel shaped shoe having an inwardly extending radial side "flange adjacent the apron. and an axially disposed pin lying within the channel of the shoe and contacting with the said flange and being slidably supported relative to the apron and resiliently urged toward the apron.

5. A brake having an. apron, a shoe and a device adjustably secured to the apron and radially contacting with the shoe to limit the inward radial movement thereof, said device having a Separate part resiliently urged into contact with the shoe exerting an axial force on the shoe toward the apron.

6. A brake having an apron, a channel shaped shoe and a device adjustably secured to the apron and extending between the side termining its idle position, and means asso ci'ated with said part for urging said shoe toward the apron to prevent. rattling of said shoe against the apron.

8. In a brake, the combination of an apron, a shoe, an adjustable retractor stop for the shoe' carried by the apron comprising a part adjustably positioned relative to the apron and radially contacting with the shoe for determining the idle position of the shoe, and

means associated with said part for urging said shoe toward the apron to prevent rattling of said shoe against the apron.

9. A brake having an apron, a shoe, a retractor stop member for the shoe having an eccentric part contacting with the shoe for limiting inward radial movement thereof, and being adjustably clamped to the apron, a clamp bolt having a square shank passing through said member and through said apron. being rotatablein the apron but non-rotatable in said member, and an axiall disposed pin slidably: carried by said member and resiliently'urged into contact with said shoe and resiliently holding said shoe against the apron.

In testimony whereof, ll hereunto aflix my signature.

- JQHN SNEED. 

